12-letter words containing a, b, y, i
- bastille day — (in France) an annual holiday on July 14, commemorating the fall of the Bastille
- bathetically — in a bathetic fashion
- bathygraphic — of or relating to the depths of the ocean
- bathypelagic — of, relating to, or inhabiting the lower depths of the ocean between approximately 1000 and 4000 metres
- battery acid — acid used in batteries, esp car batteries
- battery fire — the firing of a battery of weapons
- beatifically — bestowing bliss, blessings, happiness, or the like: beatific peace.
- beauty strip — a narrow forest corridor left uncut alongside a road or body of water.
- behaviorally — manner of behaving or acting.
- belaying pin — a cylindrical, sometimes tapered pin, usually of metal or wood, that fits into a hole in a pin or fife rail: used for belaying
- belly-aching — Informal. a pain in the abdomen or bowels.
- belt highway — beltway (def 1).
- beneficially — conferring benefit; advantageous; helpful: the beneficial effect of sunshine.
- bermuda lily — a lily, Lilium longiflorum eximium, having white, funnel-shaped flowers, cultivated especially as an Easter lily.
- bi-quarterly — occurring twice in each quarter of a year.
- bibliography — A bibliography is a list of books on a particular subject.
- bicarpellary — (of an ovary) having two carpels
- bicycle path — a path designed for bicyclists
- bicycle race — cycling (def 2).
- bicycle rack — a metal frame for securing bicycles when they are not in use
- bilinguality — the ability to speak two languages fluently.
- binary color — secondary color.
- binary digit — either of the two digits 0 or 1, used in binary notation
- binocularity — binocular characteristics
- bioastronomy — the branch of biology which deals with the study or the discovery of life forms on other planets or in space
- biogeography — the branch of biology concerned with the geographical distribution of plants and animals
- biologically — pertaining to biology.
- biparentally — from a biparental point of view
- birch family — the plant family Betulaceae, characterized by deciduous trees having simple serrate leaves, male flowers in drooping catkins, female flowers in short clusters, and one-seeded nuts, and including the alder, birch, hazel, and hornbeam.
- birth family — one's biological parents and siblings, as contrasted with one's adoptive family.
- birthday boy — the boy or man whose birthday is being celebrated
- biscay green — a yellowish green.
- biscayne bay — an inlet of the Atlantic Ocean, on the SE coast of Florida, separating the cities of Miami and Miami Beach.
- black friday — the day after the US Thanksgiving Day in late November, regarded as the start of the Christmas shopping season
- body fascism — intolerance of those whose bodies do not conform to a particular view of what is desirable
- body repairs — repairs to the bodywork of cars
- bodyboarding — the sport of surfing using a bodyboard
- bombay hills — a row of hills marking the southern boundary of greater Auckland on the North Island, New Zealand
- brachycranic — having a cranial index of 81.0–85.4.
- bradykinesia — abnormal slowness of physical movement, esp as an effect of Parkinson's disease
- bradykinetic — slowness of movement, as found, for example, in Parkinson's disease.
- bridal party — the people who accompany the bride as she comes to her wedding
- bridge party — a gathering for the purpose of playing bridge
- brigham city — a city in N Utah.
- bring to bay — to force into a position from which retreat is impossible
- brushability — the quality of being brushable
- bunny rabbit — rabbit
- buoyancy aid — a type of usually foam-filled lifejacket designed for use in sports such as canoeing
- bushy-tailed — bright-eyed and bushy-tailed, fresh, alert, eager, and lively
- butyric acid — type of acid